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Submission #151234

# Submission time Handle Problem Language Result Execution time Memory
151234 2019-09-02T09:41:48 Z cfalas Network (BOI15_net) C++14
63 / 100
 9 ms 5116 KB 
#include<bits/stdc++.h>
using namespace std;
vector<vector<int> > adj;
vector<int> ans;

void dfs(int s, int p=-1){
	if(adj[s].size()==1){
		ans.push_back(s);
	}
	for(auto v : adj[s] ){
		if(v!=p) dfs(v, s);
	}
}
 
int main(){
	int n;
	adj.assign(n+100000, vector<int>());
	cin>>n;
	for(int i=0;i<n-1;i++){
		int b, c;
		cin>>b>>c;
		adj[b].push_back(c);
		adj[c].push_back(b);
	}
	dfs(1);
	cout<<(ans.size()+1)/2<<endl;
	for(int i=0;i<(ans.size()+1)/2;i++){
		cout<<ans[i]<<" "<<ans[(i+(ans.size()+1)/2)%ans.size()]<<endl;
	}
 
}

Compilation message

net.cpp: In function 'int main()':
net.cpp:27:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<(ans.size()+1)/2;i++){
              ~^~~~~~~~~~~~~~~~~
net.cpp:17:14: warning: 'n' is used uninitialized in this function [-Wuninitialized]
  adj.assign(n+100000, vector<int>());
             ~^~~~~~~

Subtask #1
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 2684 KB Output is correct
2 Correct 4 ms 2708 KB Output is correct
3 Correct 4 ms 2680 KB Output is correct
4 Correct 4 ms 2680 KB Output is correct
5 Correct 4 ms 2680 KB Output is correct
6 Correct 4 ms 2680 KB Output is correct
7 Correct 4 ms 2808 KB Output is correct
8 Correct 4 ms 2680 KB Output is correct
9 Correct 5 ms 2680 KB Output is correct
10 Correct 4 ms 2680 KB Output is correct
11 Correct 4 ms 2680 KB Output is correct
12 Correct 4 ms 2652 KB Output is correct
13 Correct 4 ms 2680 KB Output is correct
14 Correct 4 ms 2720 KB Output is correct
15 Correct 4 ms 2680 KB Output is correct
16 Correct 4 ms 2680 KB Output is correct
17 Correct 4 ms 2684 KB Output is correct
18 Correct 4 ms 2680 KB Output is correct
19 Correct 4 ms 2680 KB Output is correct
20 Correct 4 ms 2680 KB Output is correct

Subtask #2
45.0 / 45.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 2684 KB Output is correct
2 Correct 4 ms 2708 KB Output is correct
3 Correct 4 ms 2680 KB Output is correct
4 Correct 4 ms 2680 KB Output is correct
5 Correct 4 ms 2680 KB Output is correct
6 Correct 4 ms 2680 KB Output is correct
7 Correct 4 ms 2808 KB Output is correct
8 Correct 4 ms 2680 KB Output is correct
9 Correct 5 ms 2680 KB Output is correct
10 Correct 4 ms 2680 KB Output is correct
11 Correct 4 ms 2680 KB Output is correct
12 Correct 4 ms 2652 KB Output is correct
13 Correct 4 ms 2680 KB Output is correct
14 Correct 4 ms 2720 KB Output is correct
15 Correct 4 ms 2680 KB Output is correct
16 Correct 4 ms 2680 KB Output is correct
17 Correct 4 ms 2684 KB Output is correct
18 Correct 4 ms 2680 KB Output is correct
19 Correct 4 ms 2680 KB Output is correct
20 Correct 4 ms 2680 KB Output is correct
21 Correct 4 ms 2680 KB Output is correct
22 Correct 9 ms 2808 KB Output is correct
23 Correct 9 ms 2808 KB Output is correct
24 Correct 9 ms 2808 KB Output is correct
25 Correct 8 ms 2808 KB Output is correct
26 Correct 7 ms 2684 KB Output is correct
27 Correct 8 ms 2812 KB Output is correct
28 Correct 8 ms 2808 KB Output is correct
29 Correct 7 ms 2808 KB Output is correct
30 Correct 4 ms 2680 KB Output is correct
31 Correct 8 ms 2808 KB Output is correct
32 Correct 4 ms 2680 KB Output is correct
33 Correct 4 ms 2680 KB Output is correct
34 Correct 4 ms 2680 KB Output is correct
35 Correct 4 ms 2684 KB Output is correct
36 Correct 4 ms 2680 KB Output is correct
37 Correct 5 ms 2680 KB Output is correct
38 Correct 5 ms 2808 KB Output is correct
39 Correct 4 ms 2684 KB Output is correct
40 Correct 4 ms 2684 KB Output is correct
41 Correct 4 ms 2680 KB Output is correct
42 Correct 5 ms 2680 KB Output is correct
43 Correct 7 ms 2680 KB Output is correct
44 Correct 5 ms 2680 KB Output is correct
45 Correct 5 ms 2680 KB Output is correct
46 Correct 6 ms 2680 KB Output is correct
47 Correct 4 ms 2680 KB Output is correct
48 Correct 5 ms 2680 KB Output is correct
49 Correct 7 ms 2680 KB Output is correct
50 Correct 4 ms 2680 KB Output is correct
51 Correct 4 ms 2680 KB Output is correct
52 Correct 5 ms 2680 KB Output is correct
53 Correct 6 ms 2728 KB Output is correct
54 Correct 5 ms 2680 KB Output is correct
55 Correct 5 ms 2680 KB Output is correct
56 Correct 5 ms 2680 KB Output is correct
57 Correct 6 ms 2680 KB Output is correct
58 Correct 9 ms 2808 KB Output is correct

Subtask #3
0 / 37.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 2684 KB Output is correct
2 Correct 4 ms 2708 KB Output is correct
3 Correct 4 ms 2680 KB Output is correct
4 Correct 4 ms 2680 KB Output is correct
5 Correct 4 ms 2680 KB Output is correct
6 Correct 4 ms 2680 KB Output is correct
7 Correct 4 ms 2808 KB Output is correct
8 Correct 4 ms 2680 KB Output is correct
9 Correct 5 ms 2680 KB Output is correct
10 Correct 4 ms 2680 KB Output is correct
11 Correct 4 ms 2680 KB Output is correct
12 Correct 4 ms 2652 KB Output is correct
13 Correct 4 ms 2680 KB Output is correct
14 Correct 4 ms 2720 KB Output is correct
15 Correct 4 ms 2680 KB Output is correct
16 Correct 4 ms 2680 KB Output is correct
17 Correct 4 ms 2684 KB Output is correct
18 Correct 4 ms 2680 KB Output is correct
19 Correct 4 ms 2680 KB Output is correct
20 Correct 4 ms 2680 KB Output is correct
21 Correct 4 ms 2680 KB Output is correct
22 Correct 9 ms 2808 KB Output is correct
23 Correct 9 ms 2808 KB Output is correct
24 Correct 9 ms 2808 KB Output is correct
25 Correct 8 ms 2808 KB Output is correct
26 Correct 7 ms 2684 KB Output is correct
27 Correct 8 ms 2812 KB Output is correct
28 Correct 8 ms 2808 KB Output is correct
29 Correct 7 ms 2808 KB Output is correct
30 Correct 4 ms 2680 KB Output is correct
31 Correct 8 ms 2808 KB Output is correct
32 Correct 4 ms 2680 KB Output is correct
33 Correct 4 ms 2680 KB Output is correct
34 Correct 4 ms 2680 KB Output is correct
35 Correct 4 ms 2684 KB Output is correct
36 Correct 4 ms 2680 KB Output is correct
37 Correct 5 ms 2680 KB Output is correct
38 Correct 5 ms 2808 KB Output is correct
39 Correct 4 ms 2684 KB Output is correct
40 Correct 4 ms 2684 KB Output is correct
41 Correct 4 ms 2680 KB Output is correct
42 Correct 5 ms 2680 KB Output is correct
43 Correct 7 ms 2680 KB Output is correct
44 Correct 5 ms 2680 KB Output is correct
45 Correct 5 ms 2680 KB Output is correct
46 Correct 6 ms 2680 KB Output is correct
47 Correct 4 ms 2680 KB Output is correct
48 Correct 5 ms 2680 KB Output is correct
49 Correct 7 ms 2680 KB Output is correct
50 Correct 4 ms 2680 KB Output is correct
51 Correct 4 ms 2680 KB Output is correct
52 Correct 5 ms 2680 KB Output is correct
53 Correct 6 ms 2728 KB Output is correct
54 Correct 5 ms 2680 KB Output is correct
55 Correct 5 ms 2680 KB Output is correct
56 Correct 5 ms 2680 KB Output is correct
57 Correct 6 ms 2680 KB Output is correct
58 Correct 9 ms 2808 KB Output is correct
59 Runtime error 8 ms 5116 KB Execution killed with signal 11 (could be triggered by violating memory limits)
60 Halted 0 ms 0 KB -